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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13397a6922a59dd60fba339b55705c0c4b577ae28f4383f0ed6b61741443456' 
  AND token = '4IGSG67/xnFk97p21IY3oAllG/j+ICE9y9ydAYx72tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}